vs-blue.yaml

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: [APP_VS]
  namespace: [APP]
spec:
  gateways:
  - default/default-gateway
  hosts:
  - [HOST]
  http:
  - match:
    - uri:
        prefix: /
    route:
    - destination:
        host: [APP_SERVICE].[NAMESPACE].svc.cluster.local
        subset: blue
        port:
          number: 80
      weight: 100
    - destination:
        host: [APP_SERVICE].[NAMESPACE].svc.cluster.local
        subset: green
        port:
          number: 80
      weight: 0